VSO

VSO is a three-letter acronym with multiple meanings, as described below:

Voluntary Service Overseas, an international development charity
Valdosta Southern Railroad
Vancouver Symphony Orchestra, a Canadian orchestra performing in Vancouver, British Columbia
Variable Speed Oscillator
Verb–subject–object in Linguistic typology
Vermont Symphony Orchestra, a symphony orchestra based in, and supported in part by, the U.S. state of Vermont. It is a 501(c)(3) corporation. It is one of the few, and the oldest, state-supported symphony orchestras in the United States
Victoria State Opera, Australian opera company, merged in 1996 with Opera Australia
Vienna State Opera, an opera house – and opera company – with a history dating back to the mid-19th century
Vienna Symphony Orchestra
Volvo Super Olympian (Volvo B10TL), double-decker bus
Video du Sud Ouest, a french software company known as VSO Software, specialized in video conversion, burning and photo applications, selling worldwide
Very Superior Old (VSO designation on brandy or port bottles indicating an age of 12–17 years)

In aviation, V_SO is an aircraft's stall speed in the landing configuration

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